Very Degenerate Higgsino Dark Matter

  • Eung Jin Chun
  • Sunghoon Jung
  • Jong-Chul Park
Open Access
Regular Article - Theoretical Physics


We present a study of the Very Degenerate Higgsino Dark Matter (DM), whose mass splitting between the lightest neutral and charged components is \( \mathcal{O}(1) \) MeV, much smaller than radiative splitting of 355 MeV. The scenario is realized in the minimal supersymmetric standard model by small gaugino mixings. In contrast to the pure Higgsino DM with the radiative splitting only, various observable signatures with distinct features are induced. First of all, the very small mass splitting makes (a) sizable Sommerfeld enhancement and Ramsauer-Townsend (RT) suppression relevant to ∼1 TeV Higgsino DM, and (b) Sommerfeld-Ramsauer-Townsend effect saturate at lower velocities v/c ≲ 10−3. As a result, annihilation signals can be large enough to be observed from the galactic center and/or dwarf galaxies, while the relative signal sizes can vary depending on the locations of Sommerfeld peaks and RT dips. In addition, at collider experiments, stable chargino signatures can be searched for to probe the model in the future. DM direct detection signals, however, depend on the Wino mass; even no detectable signals can be induced if the Wino is heavier than about 10 TeV.


Supersymmetry Phenomenology 


Open Access

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Copyright information

© The Author(s) 2017

Authors and Affiliations

  • Eung Jin Chun
    • 1
  • Sunghoon Jung
    • 2
    • 3
  • Jong-Chul Park
    • 4
  1. 1.Korea Institute for Advanced StudySeoulKorea
  2. 2.SLAC National Accelerator LaboratoryMenlo ParkU.S.A.
  3. 3.Kavli Institute for Theoretical PhysicsSanta BarbaraU.S.A.
  4. 4.Department of PhysicsChungnam National UniversityDaejeonKorea

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